The details of how the body is actually made is of less importance than the end result when it comes to an exacting definition of "replica" in my view. Stamped, some hand work, finishing touches to smooth and straighten, etc. The end result should be a body that is incredibly accurate to dimensions, shape and size, comprised of a similiar material as used on the original. For a GS Vette, that would be glass! For a Cobra, aluminum.
I'd have to deduct a few points from the CSX1000 offered by BJ for the Kirkham billet expansion tank. Which begs the question, what other departures from original specs were taken? Suspension bits? Brakes? And of course, I'd have to check it's nut's,,,, and bolt's.